Cathode assembly



Jail. 15 1946.

v R. OLARTE ET AL CATHODE ASSEMBLY Filed Jan. 18, 1944 I'll WE Pi! I inventor RUDOLPH 01/4/57 E AND KURT SPL ZA Gttorneg Patented Jan. 15, 1946 CATHODE ASSEMBLY Rudolph OLarte, Rego Park, N. Y., and Kurt Speck, Palisade Park, N. J., assignors to Jacques Kriesler Manufacturing Corporation, North Bergen, N. J a corporation of New Jersey Application January 18, 1944, Serial No. 518,684

9 Claims. (01. 250-162) This invention relates to a cathode assembly for a cathode-ray tube or the like.

One object of the invention is to produce a cathode assembly construction in which provision is made to facilitate the mounting of the cathode in proper position in relation to the electron aperture of the grid.

Another object of the invention is to provide a cathode assembly construction by which the assembly operation for producing cathodes for cathode-ray tubes is greatly facilitated.

Another object of the invention is to provide a cathode assembly construction wherein the oathode may be removably secured in position so that it can be replaced in the event that it is defective.

A further object is to provide an improved cathode unit for a cathode assembly for a cathoderay tube or the like.

The above and other objects, features, and advantages will be fully understood from the following description, reference being had to the accompanying illustrative drawing.

In the drawing:

Fig. 1 is an enlarged side view, in elevation, of

a cathode assembly embodying the present invention;

Fig. 2 is an end view thereof;

. Fig. 3 is a sectional view on the line 3-3 of Fig. 2;

Fig. 4 is a sectional view of the cathode and of a part associated therewith;

Fig. 5 is a sectional view of a spacer member provided in the cathode assembly in accordance with the present invention;

Fig. 6 is a perspective view of a holding member forming a part of the cathode assembly;

Fig. 7 is a view similar to Fig. 3, showing a somewhat different arrangement of the parts and flanges 20 which are bent over adjacent portions of flanges l8. Flanges l8 and 2B are provided with lateral extensions having flat abutting portions 24 and 25 complementary. semi-cylindrical portions 28 and 30, which define small tubular parts for mounting the cathode assembly on insulatio-n rods in the electron gun mount in the cathode-ray tube, and flat abutting end portions 32 and 34. The flat abutting'portions 24, 25 and 32, 34 are spot welded to each other as indicated by the dots on portions 24 and 32 in Fig. 1.

Tubular member I2 is provided with outwardly pressed peripheral ribs 36 and 38 near the opposite ends thereof, respectively, forming corresponding internal peripheral grooves in said tubular member. A disc 40 is mounted in tubular member l8 at the front end thereof and is provided with a central electron aperture 42. Said disc has a peripheral flange 44 provided with an outwardly pressed rib 45 which is received in the peripheral groove formed by the outwardly pressed rib 36 of tubular member I2. It will be understood that disc 40 is formed in one piece and is secured in position between tubular parts I4 and I5 at the time the latter are assembled and secured to each other. Disc 40 is provided with a circular reinforcing bead 41 pressed from the material of said disc. As shown in Fig. 3, disc 40 is positioned at the front of tubular member [2 with flange 44 of said disc extending toward the front end of said tubular member, while as shown in Fig. 7 the position of said disc is reversed, and from this it will be understood that the construction and relation of tubular member l2 and disc 40 are such as to permit the disc to be positioned either as shown in Fig. 3 or as shown in Fig. '7.

In accordance with the present invention, pro vision is made for mounting the cathode 48 with the forward or electron-emissive end thereof in proper relation to the electron aperture 42. As here shown, said cathode is of the indirectly heated type and comprises a sheet metal tube 50 in which the usual electric filament or heatingelement (not shown) is positioned. Said tube 50 is closed at its front end by a cap 52 which carries the electron-emissive material, said cap being fixed to the adjacent end portion of said tube. A circular rigid disc 54 formed of ceramic or other insulation material is secured to tube 50 near the forward end thereof and is held against movement longitudinally of said tube by the lateral projections formed as here shown by a flange 56 provided on cap 52 and by a collar 58 which as shown in Fig. 4 is constituted by an outwardly pressed peripheral rib or head with which tube 50 is provided. It will be understood that in assembling insulation disc 54 with tube 50 and cap 52, tube 54 is projected through the central cirin position and that after said disc is mounted ode mounted therein are insertable as a unit into said tubular member, and means positioned at the other side of said disc for holding the latter in position adjacent said spacing member.

4. In a cathode assembly for a cathode-ray tube, said assembly comprising a tubular member provided with an electron-aperture and a cathode disposed within said tubular member; an insulation disc slidably fitting in said tubular member and provided with an opening in which said cathode is mounted for holding said cathode in axial alignment with said aperture of said tubular member, a member disposed between the apertured end of said tubular member and the adjacent side of said insulation disc for spacing said ing member, said last mentioned means comprising a member having a part positioned adjacent said other side of said disc in radially spaced relation to said cathode and parts extending longitudinally of said tubular member toward said open end thereof, and releasable interengaging means on said tubular member and said longitudinally extending parts for releasably securing said discholding means in position in said tubular member.

5. In a cathode assembly for a cathode-ray tube, said assembly comprising a tubular member provided with an electron-aperture and a cathode disposed within said tubular member; an insulation disc slidably fitting in said tubular member and provided with an opening in which said cathode is mounted for holding said cathode in axial alignment with said aperture of said tubular member, a member disposed between the apertured end of said tubular member and the adjacent side of said insulation disc for spacing said cathode from said aperture axially thereof, said tubular member having an end opening through which said spacing member and said insulation 7 disc With the cathode mounted therein are insertable into said tubular member, and means for holding said disc in position adjacent said spacing member, said last mentioned means comprising a member having a part positioned adjacent said other side of said disc in radially spaced relation to said cathode and parts extending longitudinally of said tubular member toward said open end thereof, said tubular member having a recessed portion in its inner surface and at least one of said longitudinally extending parts having a lateral projection releasably engageable with said tubular member in said recessed portion for releasably securing said disc-holding means in position in said tubular member.

6. In a cathode assembly for a cathode-ray tube, said assembly comprising a tubular member provided with an electron-aperture and a cathode disposed within said tubular member; an insulation disc slidably fitting in said tubular member and provided with an opening in which, said cath ode is mounted for holding said cathode in axial alignment with said aperture of said tubular member, a member disposed between the apertured end of said tubular member and the adjacent side of said insulation disc for spacing said cathode from said aperture axially thereof, said tubular member having an end opening through which said spacing member and said insulation disc with the cathode mounted therein are insertable into said tubular member, and means for holding said disc in position adjacent said spacing member, said last mentioned means comprising a member having apart positioned adjacent said other side of said disc in radially spaced relation to said cathode and parts extending longitudinally of said tubular member toward said open end thereof, said tubular member having a recessed portion in its inner surface and at least one of said longitudinally extending parts being formed of spring metal and having a lateral projection releasably engageable with said tubular member in said recessed portion for releasably securing said disc-holding means in position in said tubular member.

'7. A cathode assembly for a cathode-ray tube, comprising a tubular member provided with longitudinally spaced peripheral grooves in its inner surface, a disc provided with an electron-aperture positioned in said tubular member and havin its peripheral edge positioned in one of said grooves and thereby secured in position in said tubular member, an insulation disc slidably fitting in said tubular member and provided with an opening in which said cathode is mounted for holding said cathode in axial alignment with said aperture of said tubular member, a member disposed between said discs for spacing said cathode from said aperture axially thereof, said tubular member having an end opening through which said spacing member and said insulation disc with the cathode mounted therein are insertable into said tubular member, and means for holding said insulation disc adjacent said spacing member comprising a member having a part positioned adjacent said other side of said disc in radially spaced relation to said cathode and a part extending longitudinally of said tubular member toward said opening thereof, said part being formed of a spring metal and having a lateral projection releasably engageable with said tubular member in another of said peripheral rooves thereof for releasably securing said holding means in position in said tubular member.

8. A cathode unit for a cathode-ray tube comprising a tube open at one end to receive an electric heating element, a cap mounted at the other end of said tube to carry the electron-emissive material of the cathode, said tube and cap having lateral projections, and an insulation member mounted in position on said tube between the opposite ends thereof and held in said position by said lateral projections.

9. A cathode unit for a cathode-ray tube comprising a tube open at one end to receive an electric heating element, a cap mounted at the other end of said tube to carry the electron-emissive material of the cathode, aid tube having an outwardly pressed peripheral rib formed therein and said cap having a lateral projection, and an insulation disc mounted on said tube between said rib and projection and thereby secured in position on the tube between the opposite ends thereof.

RUDOLPH OLARTE. KURT SPECK. 

